rickets is a nutritional disorder that can develop if you do not get enough vitamin d calcium or phosphate rickets leads to poor functioning of a bone s growth plate growing edge softened and weakened bones stunted growth and in severe cases skeletal deformities
Hence, a 20-year period of the patent usually gives manufacturers a chance to recoup the cost of developing a new drug. When a drug patent expires, any pharmaceutical company can manufacture and sell the drug. A drug, which is produced and distributed without patent protection is called a generic drug.
1 Patents that issued before the 1995 changeover have a term of 17 years from the patent issuance date. 2  Patents that were filed before the 1995 date but issued afterwards get the longer of the two terms. 3  Most patents issued in the past decade have an added term adjustment (PTA) due to delays in examination at the USPTO.